Hi Chrissy
I have a few Amoena bras that I bought in David Jones and from my lovely lady, but I have also bought some on-line via a UK website called Nicola Jane - www.nicolajane.com the bras are really pretty and following their measuring guide they actually fit perfectly they are also much cheaper than the ones here. I also bought a bikini from them which looks great was 30 UK pounds about $50 which is a lot cheaper than the Amoena swimsuit I bought for $120 ( also looks great on) in Spirit of life boutique in Brisbane lovely shop lots of choice they also do on-line too. It's an expensive business this BC.
Answering your question about movement no it pretty much stays put, but beware leaning over the shopping trolley in Woolies with a low cut top on cos those men get a hell of a shock when they look down your top and see no boob lol that'll teach them!! I have the prosthesis that goes in the bra pocket, I could not stand having it stuck to me with the amount of sweating I do it would fall off !! Also if you are doing radiation you really want to keep your skin in tip top condition before the treatment and not irritate it with adhesives and things.
Hope that helps all power to 36DD!!
Sarah x
PS leave the sports bras alone I haven't even tried to get into one! Too hard basket.........